Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!apple!sun-barr!newstop!sun!quintus!jbeard
From: jbeard@quintus.UUCP (Jeff Beard)
Newsgroups: comp.databases
Subject: Re: Concurrency control in real life
Keywords: concurrency updates
Message-ID: <1227@quintus.UUCP>
Date: 28 Jul 89 15:03:06 GMT
References: <322@csense.UUCP>
Reply-To: jbeard@quintus.UUCP (Jeff Beard)
Organization: Quintus Computer Systems, Inc: Mountain View, Ca
Lines: 10

As an example of 'real life concurrency', 

	Let a family of four have a girl and a boy, both teenagers with
divers licenses.  Due to a mechanical problem on the second car,
mom's VM is in the shop.  Dad has a buisness meeting across town at 8pm,
junior wants to go to the drive-in with his date, and sis is scheduled to
be at her job at 8pm ... of course it is at the other end of town.

Concurrency control is necessary and is in fact defacto ... there is only 
one car.  He who grabs the keys gets to run away, all the others get to stay!